Interpretation: From the data’s of the radioactive decay of a substance, first order decay constant and half-life of the reaction should be calculated
- Unstable nuclei emit radiation spontaneously to become stable nuclei by losing energy. This process of emission of radiation by unstable nuclei is known as radioactive decay.
- These emitted radiations may be alpha radiations(), beta radiations() or gamma radiations()
- These unstable nuclei are the nuclei with more than 83 protons and which do not lie within the belt of stability.
- Radioactive decay is in the first order kinetics. Rate of radioactive decay at a time t is,
Suppose the number of radioactive nuclei at time zero is and at a time t is ,
- Half-life of radioactive decay is the time required for a radioactive sample to decay to one half of the atomic nucleus.
Half-life of the radiation,
Half-life and rate constant for radioactive isotopes vary greatly from nucleus to nucleus.